InvertebrateClassification and  Relationships
Introduction• One million animal species have been described  and named so far.• 4 to 10 million animal species awaits dis...
• Cambrian Explosion- the sudden appearance and  diversification of complex animals over some  550 million years ago.• Bef...
Classification by Cell Number, Embryonic         Patterns and Body Symmetry• Single celled or unicellular• Multicellular o...
General body Form• Bilateral Symmetry-possessing right and  left sides that are approximate mirror  images of each other• ...
Radial and Bilateral Symmetry
General body Form ( cont )• Radial symmetry- organism can be divided  into two approximately equal halves by any  cut that...
Classification by Developmental              Pattern• Based on number of Germ layers formed  during embryogenesis• Germ la...
• Diploblastic- 2 germ layers; ectoderm and  endoderm• Triploblastic- 3 germ layers; ectoderm,  endoderm and mesoderm- alw...
Diploblastic and Triploblastic Layer
Based on presence or absence of              Coelom 1. Acoelomic- without body cavity, region    lying between the outer b...
Eucoelomic Animal
Classification of Animal Based From Coelom                   Formation• Schizocoely-coelom formation occurs by  gradual en...
Types of Coelom Formation
Depending on Mouth Formation              ( Stomes )•    Protostomes ( first mouth )- mouth forms     from the blastophore...
Types of Cleavage• Radial- the spindles of a given cell and the  cleavage planes are oriented either parallel or  perpendi...
Types of Cleavage• Spiral- the spindle axes of cells are oriented at  45 degrees angles to the animal-vegetal axis;  the d...
Radial and Spiral Cleavage
Indeterminate and Determinate          Cleavage
Fate of Cells with Respect to Cleaving                 Embryos• In Deuterostomes, one can separate the cells  of a two-cel...
• Protostomes –much of the mesodermal tissue  derives from a single cell of the 64 –cell  embryo, located at the edge of t...
Carolus Linnaeus, father of Taxonomy, gave thebinomial system of naming organisms. The first part of thesystem is the genu...
Hierarchical Classification• Beyond the grouping of organism  within the genera, taxonomy  extends into broader categories...
Scientist classifies organisms by getting the general similarities of theorganisms. Next, scientists gets more specific an...
Classification and Phylogeny• Systematics has some other goals beyond  classifying organisms. By comparing the  similariti...
Sorting through Homology• This is classification by looking at the same  structures of several species.• Species of differ...
Molecular Biology used in            classification• This is classification by comparing the  genes and proteins of organi...
Cladistic Approach• This method is based on derived similarities.  Unlike other classification, this is based on the  over...
Example of a Cladogram
In 1969 Whittaker argued on a five kingdom system. Hereare the characteristics of each kingdom.
Classification and Nomenclature
Classification and Nomenclature
Classification and Nomenclature
Classification and Nomenclature
Classification and Nomenclature
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Classification and Nomenclature

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  • Classification and Nomenclature

    1. 1. InvertebrateClassification and Relationships
    2. 2. Introduction• One million animal species have been described and named so far.• 4 to 10 million animal species awaits discovery and description.• First animals may have evolved 3 billion years ago. Earth is 4.5 billion years old• First metazoan animal similar to the present day animals appear during the Cambrian Period
    3. 3. • Cambrian Explosion- the sudden appearance and diversification of complex animals over some 550 million years ago.• Before we can consider the evolutionary interrelationships among different groups of organisms we must sort the millions of animals species into categories.• Sorting out by means of their similarity and differences
    4. 4. Classification by Cell Number, Embryonic Patterns and Body Symmetry• Single celled or unicellular• Multicellular or many celled- Metazoans• True metazoans are multicellular, diploid organisms, develops into blastula• Widely agreed that the earliest invertebrates are unicellular and multicellularity was an evolutionary innovation
    5. 5. General body Form• Bilateral Symmetry-possessing right and left sides that are approximate mirror images of each other• Bilateral symmetry is highly correlated with cephalization- concentration of the nervous and sensory tissues and organs at one end of the animal resulting in distinct anterior and posterior ends.
    6. 6. Radial and Bilateral Symmetry
    7. 7. General body Form ( cont )• Radial symmetry- organism can be divided into two approximately equal halves by any cut that passes through the center of the animal.• Assymetrical- possessing no symmetry at all, that is the animal cannot be equally divided
    8. 8. Classification by Developmental Pattern• Based on number of Germ layers formed during embryogenesis• Germ layers- group of cells behaving as a unit during the early stages of embryonic development and giving rise to distinctly different tissue and or organ systems in the adult.
    9. 9. • Diploblastic- 2 germ layers; ectoderm and endoderm• Triploblastic- 3 germ layers; ectoderm, endoderm and mesoderm- always at the middle of ectoderm and endoderm• Ectoderm outer layer- give rise to the skin• Endoderm – inner layer give rise to the internal organs
    10. 10. Diploblastic and Triploblastic Layer
    11. 11. Based on presence or absence of Coelom 1. Acoelomic- without body cavity, region lying between the outer body wall and gut is solid• 2. Pseudocoelomic- not true body cavity; region between the outer body wall and the gut is a fluid filled cavity• 3. Eucoelomic- true body cavity; an internal fluid filled body cavity lying between the gut and outer body wall musculature and lined with tissue derived from embryonic mesoderm
    12. 12. Eucoelomic Animal
    13. 13. Classification of Animal Based From Coelom Formation• Schizocoely-coelom formation occurs by gradual enlargement of a split in the mesoderm; present among protostomes• Enterocoely- coelom is formed from the evagination of the archenteron into the blastocoel of the embryo; present among deuterostomes• Whether the coelom is formed by enterocoely or schizocoely the end result is similar
    14. 14. Types of Coelom Formation
    15. 15. Depending on Mouth Formation ( Stomes )• Protostomes ( first mouth )- mouth forms from the blastophore - number of coelomic cavities formed is highly variable• Deuterostomes ( second mouth )- mouth arises away from the embryonic blastophore - number of coelomic cavities divides into 3 coelomic pouches
    16. 16. Types of Cleavage• Radial- the spindles of a given cell and the cleavage planes are oriented either parallel or perpendicular to the animal-vegetal axis• Daughter cells derived from a division in which the cleavage plane is parallel to the animal –vegetal axis ends up lying in the same plane as the original mother cell• Two daughter cell resulting from a division perpendicular to the animal-vegetal axis come to lie directly one atop the other with the center of the upper cell directly over the center of the underlying cell
    17. 17. Types of Cleavage• Spiral- the spindle axes of cells are oriented at 45 degrees angles to the animal-vegetal axis; the division line may not pass through the center of the dividing cell• As a result the eight cell stage consists of micromeres –group of smaller cells lying in the spaces between the underlying macromeres- larger cells• Cell division continues in this fashion , with the cleavage planes oblique to the polar axis of the embryo
    18. 18. Radial and Spiral Cleavage
    19. 19. Indeterminate and Determinate Cleavage
    20. 20. Fate of Cells with Respect to Cleaving Embryos• In Deuterostomes, one can separate the cells of a two-cell or four cell embryo and each cell will typically develop into small but complete and fully functional animal- indeterminate or regulative cleavage.• In Protostomes- developmental potential of each cell is irrevocably determined at the first cleavage- determinate or mosaic cleavage• Protostomes never produce identical twins
    21. 21. • Protostomes –much of the mesodermal tissue derives from a single cell of the 64 –cell embryo, located at the edge of the blastopore• Deuterostomes produces embryo from the walls of the archenteron• Polar lobe- produced by some protostome only – conspicuous bulge of cytoplasm that forms prior to cell division.The lobe contains no nuclear material
    22. 22. Carolus Linnaeus, father of Taxonomy, gave thebinomial system of naming organisms. The first part of thesystem is the genus where the species belongs and thesecond part refers to one species within the genus.
    23. 23. Hierarchical Classification• Beyond the grouping of organism within the genera, taxonomy extends into broader categories. Beyond the genus is the family, order, classes, phyla kingdoms and domains.
    24. 24. Scientist classifies organisms by getting the general similarities of theorganisms. Next, scientists gets more specific and identify more detailed similarities.This classifies the phylum. More detailed similarities are identified and so on.
    25. 25. Classification and Phylogeny• Systematics has some other goals beyond classifying organisms. By comparing the similarities of various organism, Scientists manage to trace the evolutionary history of a species, which is phylogeny. Through hierarchical classification of several species, it can form a phylogenetic tree. This can be based on fossil records, homologous structure, comparison of DNA and cladistic analysis
    26. 26. Sorting through Homology• This is classification by looking at the same structures of several species.• Species of different evolutionary branch may have similar structures as it is the result of adaptation and natural selection. This is called convergent evolution. For example the wings of insect and birds.
    27. 27. Molecular Biology used in classification• This is classification by comparing the genes and proteins of organisms. Scientists arranged similarly structured genes and inferred that the organisms have a common ancestry.
    28. 28. Cladistic Approach• This method is based on derived similarities. Unlike other classification, this is based on the overall similarities, in other words it looks for several similarities in determining the evolutionary relationship.• Willi Hennig is widely regarded as the founder of cladistics.• The advantage of this approach is that all data that forms the basis of postulated relationships is shown, which often suggests new relationships, and can be more readily tested.
    29. 29. Example of a Cladogram
    30. 30. In 1969 Whittaker argued on a five kingdom system. Hereare the characteristics of each kingdom.
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